/* Copyright 2012 The Netty Project
 * 
 * The Netty Project licenses this file to you under the Apache License, version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at:
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License. */
package io.netty.example.proxy;

import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

public class HexDumpProxyBackendHandler extends ChannelInboundHandlerAdapter {

	private final Channel inboundChannel;

	public HexDumpProxyBackendHandler(Channel inboundChannel) {
		this.inboundChannel = inboundChannel;
	}

	@Override
	public void channelActive(ChannelHandlerContext ctx) {
		ctx.read();
		ctx.write(Unpooled.EMPTY_BUFFER);
	}

	@Override
	public void channelRead(final ChannelHandlerContext ctx, Object msg) {
		inboundChannel.writeAndFlush(msg).addListener(new ChannelFutureListener() {
			@Override
			public void operationComplete(ChannelFuture future) {
				if (future.isSuccess()) {
					ctx.channel().read();
				} else {
					future.channel().close();
				}
			}
		});
	}

	@Override
	public void channelInactive(ChannelHandlerContext ctx) {
		HexDumpProxyFrontendHandler.closeOnFlush(inboundChannel);
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		cause.printStackTrace();
		HexDumpProxyFrontendHandler.closeOnFlush(ctx.channel());
	}
}
